drivers/isdn/i4l/isdn_common.c

   1 /* $Id: isdn_common.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $
   2  *
   3  * Linux ISDN subsystem, common used functions (linklevel).
   4  *
   5  * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
   6  * Copyright 1995,96    Thinking Objects Software GmbH Wuerzburg
   7  * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
   8  *
   9  * This software may be used and distributed according to the terms
  10  * of the GNU General Public License, incorporated herein by reference.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/poll.h>
  17 #include <linux/vmalloc.h>
  18 #include <linux/isdn.h>
  19 #include <linux/smp_lock.h>
  20 #include "isdn_common.h"
  21 #include "isdn_tty.h"
  22 #include "isdn_net.h"
  23 #include "isdn_ppp.h"
  24 #ifdef CONFIG_ISDN_AUDIO
  25 #include "isdn_audio.h"
  26 #endif
  27 #ifdef CONFIG_ISDN_DIVERSION_MODULE
  28 #define CONFIG_ISDN_DIVERSION
  29 #endif
  30 #ifdef CONFIG_ISDN_DIVERSION
  31 #include <linux/isdn_divertif.h>
  32 #endif /* CONFIG_ISDN_DIVERSION */
  33 #include "isdn_v110.h"
  34
  35 /* Debugflags */
  36 #undef ISDN_DEBUG_STATCALLB
  37
  38 MODULE_DESCRIPTION("ISDN4Linux: link layer");
  39 MODULE_AUTHOR("Fritz Elfert");
  40 MODULE_LICENSE("GPL");
  41
  42 isdn_dev *dev;
  43
  44 static char *isdn_revision = "$Revision: 1.1.2.3 $";
  45
  46 extern char *isdn_net_revision;
  47 extern char *isdn_tty_revision;
  48 #ifdef CONFIG_ISDN_PPP
  49 extern char *isdn_ppp_revision;
  50 #else
  51 static char *isdn_ppp_revision = ": none $";
  52 #endif
  53 #ifdef CONFIG_ISDN_AUDIO
  54 extern char *isdn_audio_revision;
  55 #else
  56 static char *isdn_audio_revision = ": none $";
  57 #endif
  58 extern char *isdn_v110_revision;
  59
  60 #ifdef CONFIG_ISDN_DIVERSION
  61 static isdn_divert_if *divert_if; /* = NULL */
  62 #endif /* CONFIG_ISDN_DIVERSION */
  63
  64
  65 static int isdn_writebuf_stub(int, int, const u_char __user *, int);
  66 static void set_global_features(void);
  67 static int isdn_wildmat(char *s, char *p);
  68 static int isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding);
  69
  70 static inline void
  71 isdn_lock_driver(isdn_driver_t *drv)
  72 {
  73         try_module_get(drv->interface->owner);
  74         drv->locks++;
  75 }
  76
  77 void
  78 isdn_lock_drivers(void)
  79 {
  80         int i;
  81
  82         for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
  83                 if (!dev->drv[i])
  84                         continue;
  85                 isdn_lock_driver(dev->drv[i]);
  86         }
  87 }
  88
  89 static inline void
  90 isdn_unlock_driver(isdn_driver_t *drv)
  91 {
  92         if (drv->locks > 0) {
  93                 drv->locks--;
  94                 module_put(drv->interface->owner);
  95         }
  96 }
  97
  98 void
  99 isdn_unlock_drivers(void)
 100 {
 101         int i;
 102
 103         for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
 104                 if (!dev->drv[i])
 105                         continue;
 106                 isdn_unlock_driver(dev->drv[i]);
 107         }
 108 }
 109
 110 #if defined(ISDN_DEBUG_NET_DUMP) || defined(ISDN_DEBUG_MODEM_DUMP)
 111 void
 112 isdn_dumppkt(char *s, u_char * p, int len, int dumplen)
 113 {
 114         int dumpc;
 115
 116         printk(KERN_DEBUG "%s(%d) ", s, len);
 117         for (dumpc = 0; (dumpc < dumplen) && (len); len--, dumpc++)
 118                 printk(" %02x", *p++);
 119         printk("\n");
 120 }
 121 #endif
 122
 123 /*
 124  * I picked the pattern-matching-functions from an old GNU-tar version (1.10)
 125  * It was originally written and put to PD by rs@mirror.TMC.COM (Rich Salz)
 126  */
 127 static int
 128 isdn_star(char *s, char *p)
 129 {
 130         while (isdn_wildmat(s, p)) {
 131                 if (*++s == '\0')
 132                         return (2);
 133         }
 134         return (0);
 135 }
 136
 137 /*
 138  * Shell-type Pattern-matching for incoming caller-Ids
 139  * This function gets a string in s and checks, if it matches the pattern
 140  * given in p.
 141  *
 142  * Return:
 143  *   0 = match.
 144  *   1 = no match.
 145  *   2 = no match. Would eventually match, if s would be longer.
 146  *
 147  * Possible Patterns:
 148  *
 149  * '?'     matches one character
 150  * '*'     matches zero or more characters
 151  * [xyz]   matches the set of characters in brackets.
 152  * [^xyz]  matches any single character not in the set of characters
 153  */
 154
 155 static int
 156 isdn_wildmat(char *s, char *p)
 157 {
 158         register int last;
 159         register int matched;
 160         register int reverse;
 161         register int nostar = 1;
 162
 163         if (!(*s) && !(*p))
 164                 return(1);
 165         for (; *p; s++, p++)
 166                 switch (*p) {
 167                         case '\\':
 168                                 /*
 169                                  * Literal match with following character,
 170                                  * fall through.
 171                                  */
 172                                 p++;
 173                         default:
 174                                 if (*s != *p)
 175                                         return (*s == '\0')?2:1;
 176                                 continue;
 177                         case '?':
 178                                 /* Match anything. */
 179                                 if (*s == '\0')
 180                                         return (2);
 181                                 continue;
 182                         case '*':
 183                                 nostar = 0;
 184                                 /* Trailing star matches everything. */
 185                                 return (*++p ? isdn_star(s, p) : 0);
 186                         case '[':
 187                                 /* [^....] means inverse character class. */
 188                                 if ((reverse = (p[1] == '^')))
 189                                         p++;
 190                                 for (last = 0, matched = 0; *++p && (*p != ']'); last = *p)
 191                                         /* This next line requires a good C compiler. */
 192                                         if (*p == '-' ? *s <= *++p && *s >= last : *s == *p)
 193                                                 matched = 1;
 194                                 if (matched == reverse)
 195                                         return (1);
 196                                 continue;
 197                 }
 198         return (*s == '\0')?0:nostar;
 199 }
 200
 201 int isdn_msncmp( const char * msn1, const char * msn2 )
 202 {
 203         char TmpMsn1[ ISDN_MSNLEN ];
 204         char TmpMsn2[ ISDN_MSNLEN ];
 205         char *p;
 206
 207         for ( p = TmpMsn1; *msn1 && *msn1 != ':'; )  // Strip off a SPID
 208                 *p++ = *msn1++;
 209         *p = '\0';
 210
 211         for ( p = TmpMsn2; *msn2 && *msn2 != ':'; )  // Strip off a SPID
 212                 *p++ = *msn2++;
 213         *p = '\0';
 214
 215         return isdn_wildmat( TmpMsn1, TmpMsn2 );
 216 }
 217
 218 int
 219 isdn_dc2minor(int di, int ch)
 220 {
 221         int i;
 222         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 223                 if (dev->chanmap[i] == ch && dev->drvmap[i] == di)
 224                         return i;
 225         return -1;
 226 }
 227
 228 static int isdn_timer_cnt1 = 0;
 229 static int isdn_timer_cnt2 = 0;
 230 static int isdn_timer_cnt3 = 0;
 231
 232 static void
 233 isdn_timer_funct(ulong dummy)
 234 {
 235         int tf = dev->tflags;
 236         if (tf & ISDN_TIMER_FAST) {
 237                 if (tf & ISDN_TIMER_MODEMREAD)
 238                         isdn_tty_readmodem();
 239                 if (tf & ISDN_TIMER_MODEMPLUS)
 240                         isdn_tty_modem_escape();
 241                 if (tf & ISDN_TIMER_MODEMXMIT)
 242                         isdn_tty_modem_xmit();
 243         }
 244         if (tf & ISDN_TIMER_SLOW) {
 245                 if (++isdn_timer_cnt1 >= ISDN_TIMER_02SEC) {
 246                         isdn_timer_cnt1 = 0;
 247                         if (tf & ISDN_TIMER_NETDIAL)
 248                                 isdn_net_dial();
 249                 }
 250                 if (++isdn_timer_cnt2 >= ISDN_TIMER_1SEC) {
 251                         isdn_timer_cnt2 = 0;
 252                         if (tf & ISDN_TIMER_NETHANGUP)
 253                                 isdn_net_autohup();
 254                         if (++isdn_timer_cnt3 >= ISDN_TIMER_RINGING) {
 255                                 isdn_timer_cnt3 = 0;
 256                                 if (tf & ISDN_TIMER_MODEMRING)
 257                                         isdn_tty_modem_ring();
 258                         }
 259                         if (tf & ISDN_TIMER_CARRIER)
 260                                 isdn_tty_carrier_timeout();
 261                 }
 262         }
 263         if (tf)
 264                 mod_timer(&dev->timer, jiffies+ISDN_TIMER_RES);
 265 }
 266
 267 void
 268 isdn_timer_ctrl(int tf, int onoff)
 269 {
 270         unsigned long flags;
 271         int old_tflags;
 272
 273         spin_lock_irqsave(&dev->timerlock, flags);
 274         if ((tf & ISDN_TIMER_SLOW) && (!(dev->tflags & ISDN_TIMER_SLOW))) {
 275                 /* If the slow-timer wasn't activated until now */
 276                 isdn_timer_cnt1 = 0;
 277                 isdn_timer_cnt2 = 0;
 278         }
 279         old_tflags = dev->tflags;
 280         if (onoff)
 281                 dev->tflags |= tf;
 282         else
 283                 dev->tflags &= ~tf;
 284         if (dev->tflags && !old_tflags)
 285                 mod_timer(&dev->timer, jiffies+ISDN_TIMER_RES);
 286         spin_unlock_irqrestore(&dev->timerlock, flags);
 287 }
 288
 289 /*
 290  * Receive a packet from B-Channel. (Called from low-level-module)
 291  */
 292 static void
 293 isdn_receive_skb_callback(int di, int channel, struct sk_buff *skb)
 294 {
 295         int i;
 296
 297         if ((i = isdn_dc2minor(di, channel)) == -1) {
 298                 dev_kfree_skb(skb);
 299                 return;
 300         }
 301         /* Update statistics */
 302         dev->ibytes[i] += skb->len;
 303
 304         /* First, try to deliver data to network-device */
 305         if (isdn_net_rcv_skb(i, skb))
 306                 return;
 307
 308         /* V.110 handling
 309          * makes sense for async streams only, so it is
 310          * called after possible net-device delivery.
 311          */
 312         if (dev->v110[i]) {
 313                 atomic_inc(&dev->v110use[i]);
 314                 skb = isdn_v110_decode(dev->v110[i], skb);
 315                 atomic_dec(&dev->v110use[i]);
 316                 if (!skb)
 317                         return;
 318         }
 319
 320         /* No network-device found, deliver to tty or raw-channel */
 321         if (skb->len) {
 322                 if (isdn_tty_rcv_skb(i, di, channel, skb))
 323                         return;
 324                 wake_up_interruptible(&dev->drv[di]->rcv_waitq[channel]);
 325         } else
 326                 dev_kfree_skb(skb);
 327 }
 328
 329 /*
 330  * Intercept command from Linklevel to Lowlevel.
 331  * If layer 2 protocol is V.110 and this is not supported by current
 332  * lowlevel-driver, use driver's transparent mode and handle V.110 in
 333  * linklevel instead.
 334  */
 335 int
 336 isdn_command(isdn_ctrl *cmd)
 337 {
 338         if (cmd->driver == -1) {
 339                 printk(KERN_WARNING "isdn_command command(%x) driver -1\n", cmd->command);
 340                 return(1);
 341         }
 342         if (!dev->drv[cmd->driver]) {
 343                 printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d] NULL\n",
 344                         cmd->command, cmd->driver);
 345                 return(1);
 346         }
 347         if (!dev->drv[cmd->driver]->interface) {
 348                 printk(KERN_WARNING "isdn_command command(%x) dev->drv[%d]->interface NULL\n",
 349                         cmd->command, cmd->driver);
 350                 return(1);
 351         }
 352         if (cmd->command == ISDN_CMD_SETL2) {
 353                 int idx = isdn_dc2minor(cmd->driver, cmd->arg & 255);
 354                 unsigned long l2prot = (cmd->arg >> 8) & 255;
 355                 unsigned long features = (dev->drv[cmd->driver]->interface->features
 356                                                 >> ISDN_FEATURE_L2_SHIFT) &
 357                                                 ISDN_FEATURE_L2_MASK;
 358                 unsigned long l2_feature = (1 << l2prot);
 359
 360                 switch (l2prot) {
 361                         case ISDN_PROTO_L2_V11096:
 362                         case ISDN_PROTO_L2_V11019:
 363                         case ISDN_PROTO_L2_V11038:
 364                         /* If V.110 requested, but not supported by
 365                          * HL-driver, set emulator-flag and change
 366                          * Layer-2 to transparent
 367                          */
 368                                 if (!(features & l2_feature)) {
 369                                         dev->v110emu[idx] = l2prot;
 370                                         cmd->arg = (cmd->arg & 255) |
 371                                                 (ISDN_PROTO_L2_TRANS << 8);
 372                                 } else
 373                                         dev->v110emu[idx] = 0;
 374                 }
 375         }
 376         return dev->drv[cmd->driver]->interface->command(cmd);
 377 }
 378
 379 void
 380 isdn_all_eaz(int di, int ch)
 381 {
 382         isdn_ctrl cmd;
 383
 384         if (di < 0)
 385                 return;
 386         cmd.driver = di;
 387         cmd.arg = ch;
 388         cmd.command = ISDN_CMD_SETEAZ;
 389         cmd.parm.num[0] = '\0';
 390         isdn_command(&cmd);
 391 }
 392
 393 /*
 394  * Begin of a CAPI like LL<->HL interface, currently used only for
 395  * supplementary service (CAPI 2.0 part III)
 396  */
 397 #include <linux/isdn/capicmd.h>
 398
 399 static int
 400 isdn_capi_rec_hl_msg(capi_msg *cm) {
 401
 402         int di;
 403         int ch;
 404
 405         di = (cm->adr.Controller & 0x7f) -1;
 406         ch = isdn_dc2minor(di, (cm->adr.Controller>>8)& 0x7f);
 407         switch(cm->Command) {
 408                 case CAPI_FACILITY:
 409                         /* in the moment only handled in tty */
 410                         return(isdn_tty_capi_facility(cm));
 411                 default:
 412                         return(-1);
 413         }
 414 }
 415
 416 static int
 417 isdn_status_callback(isdn_ctrl * c)
 418 {
 419         int di;
 420         u_long flags;
 421         int i;
 422         int r;
 423         int retval = 0;
 424         isdn_ctrl cmd;
 425         isdn_net_dev *p;
 426
 427         di = c->driver;
 428         i = isdn_dc2minor(di, c->arg);
 429         switch (c->command) {
 430                 case ISDN_STAT_BSENT:
 431                         if (i < 0)
 432                                 return -1;
 433                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 434                                 return 0;
 435                         if (isdn_net_stat_callback(i, c))
 436                                 return 0;
 437                         if (isdn_v110_stat_callback(i, c))
 438                                 return 0;
 439                         if (isdn_tty_stat_callback(i, c))
 440                                 return 0;
 441                         wake_up_interruptible(&dev->drv[di]->snd_waitq[c->arg]);
 442                         break;
 443                 case ISDN_STAT_STAVAIL:
 444                         dev->drv[di]->stavail += c->arg;
 445                         wake_up_interruptible(&dev->drv[di]->st_waitq);
 446                         break;
 447                 case ISDN_STAT_RUN:
 448                         dev->drv[di]->flags |= DRV_FLAG_RUNNING;
 449                         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 450                                 if (dev->drvmap[i] == di)
 451                                         isdn_all_eaz(di, dev->chanmap[i]);
 452                         set_global_features();
 453                         break;
 454                 case ISDN_STAT_STOP:
 455                         dev->drv[di]->flags &= ~DRV_FLAG_RUNNING;
 456                         break;
 457                 case ISDN_STAT_ICALL:
 458                         if (i < 0)
 459                                 return -1;
 460 #ifdef ISDN_DEBUG_STATCALLB
 461                         printk(KERN_DEBUG "ICALL (net): %d %ld %s\n", di, c->arg, c->parm.num);
 462 #endif
 463                         if (dev->global_flags & ISDN_GLOBAL_STOPPED) {
 464                                 cmd.driver = di;
 465                                 cmd.arg = c->arg;
 466                                 cmd.command = ISDN_CMD_HANGUP;
 467                                 isdn_command(&cmd);
 468                                 return 0;
 469                         }
 470                         /* Try to find a network-interface which will accept incoming call */
 471                         r = ((c->command == ISDN_STAT_ICALLW) ? 0 : isdn_net_find_icall(di, c->arg, i, &c->parm.setup));
 472                         switch (r) {
 473                                 case 0:
 474                                         /* No network-device replies.
 475                                          * Try ttyI's.
 476                                          * These return 0 on no match, 1 on match and
 477                                          * 3 on eventually match, if CID is longer.
 478                                          */
 479                                         if (c->command == ISDN_STAT_ICALL)
 480                                           if ((retval = isdn_tty_find_icall(di, c->arg, &c->parm.setup))) return(retval);
 481 #ifdef CONFIG_ISDN_DIVERSION
 482                                          if (divert_if)
 483                                           if ((retval = divert_if->stat_callback(c)))
 484                                             return(retval); /* processed */
 485 #endif /* CONFIG_ISDN_DIVERSION */
 486                                         if ((!retval) && (dev->drv[di]->flags & DRV_FLAG_REJBUS)) {
 487                                                 /* No tty responding */
 488                                                 cmd.driver = di;
 489                                                 cmd.arg = c->arg;
 490                                                 cmd.command = ISDN_CMD_HANGUP;
 491                                                 isdn_command(&cmd);
 492                                                 retval = 2;
 493                                         }
 494                                         break;
 495                                 case 1:
 496                                         /* Schedule connection-setup */
 497                                         isdn_net_dial();
 498                                         cmd.driver = di;
 499                                         cmd.arg = c->arg;
 500                                         cmd.command = ISDN_CMD_ACCEPTD;
 501                                         for ( p = dev->netdev; p; p = p->next )
 502                                                 if ( p->local->isdn_channel == cmd.arg )
 503                                                 {
 504                                                         strcpy( cmd.parm.setup.eazmsn, p->local->msn );
 505                                                         isdn_command(&cmd);
 506                                                         retval = 1;
 507                                                         break;
 508                                                 }
 509                                         break;
 510
 511                                 case 2: /* For calling back, first reject incoming call ... */
 512                                 case 3: /* Interface found, but down, reject call actively  */
 513                                         retval = 2;
 514                                         printk(KERN_INFO "isdn: Rejecting Call\n");
 515                                         cmd.driver = di;
 516                                         cmd.arg = c->arg;
 517                                         cmd.command = ISDN_CMD_HANGUP;
 518                                         isdn_command(&cmd);
 519                                         if (r == 3)
 520                                                 break;
 521                                         /* Fall through */
 522                                 case 4:
 523                                         /* ... then start callback. */
 524                                         isdn_net_dial();
 525                                         break;
 526                                 case 5:
 527                                         /* Number would eventually match, if longer */
 528                                         retval = 3;
 529                                         break;
 530                         }
 531 #ifdef ISDN_DEBUG_STATCALLB
 532                         printk(KERN_DEBUG "ICALL: ret=%d\n", retval);
 533 #endif
 534                         return retval;
 535                         break;
 536                 case ISDN_STAT_CINF:
 537                         if (i < 0)
 538                                 return -1;
 539 #ifdef ISDN_DEBUG_STATCALLB
 540                         printk(KERN_DEBUG "CINF: %ld %s\n", c->arg, c->parm.num);
 541 #endif
 542                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 543                                 return 0;
 544                         if (strcmp(c->parm.num, "0"))
 545                                 isdn_net_stat_callback(i, c);
 546                         isdn_tty_stat_callback(i, c);
 547                         break;
 548                 case ISDN_STAT_CAUSE:
 549 #ifdef ISDN_DEBUG_STATCALLB
 550                         printk(KERN_DEBUG "CAUSE: %ld %s\n", c->arg, c->parm.num);
 551 #endif
 552                         printk(KERN_INFO "isdn: %s,ch%ld cause: %s\n",
 553                                dev->drvid[di], c->arg, c->parm.num);
 554                         isdn_tty_stat_callback(i, c);
 555 #ifdef CONFIG_ISDN_DIVERSION
 556                         if (divert_if)
 557                          divert_if->stat_callback(c);
 558 #endif /* CONFIG_ISDN_DIVERSION */
 559                         break;
 560                 case ISDN_STAT_DISPLAY:
 561 #ifdef ISDN_DEBUG_STATCALLB
 562                         printk(KERN_DEBUG "DISPLAY: %ld %s\n", c->arg, c->parm.display);
 563 #endif
 564                         isdn_tty_stat_callback(i, c);
 565 #ifdef CONFIG_ISDN_DIVERSION
 566                         if (divert_if)
 567                          divert_if->stat_callback(c);
 568 #endif /* CONFIG_ISDN_DIVERSION */
 569                         break;
 570                 case ISDN_STAT_DCONN:
 571                         if (i < 0)
 572                                 return -1;
 573 #ifdef ISDN_DEBUG_STATCALLB
 574                         printk(KERN_DEBUG "DCONN: %ld\n", c->arg);
 575 #endif
 576                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 577                                 return 0;
 578                         /* Find any net-device, waiting for D-channel setup */
 579                         if (isdn_net_stat_callback(i, c))
 580                                 break;
 581                         isdn_v110_stat_callback(i, c);
 582                         /* Find any ttyI, waiting for D-channel setup */
 583                         if (isdn_tty_stat_callback(i, c)) {
 584                                 cmd.driver = di;
 585                                 cmd.arg = c->arg;
 586                                 cmd.command = ISDN_CMD_ACCEPTB;
 587                                 isdn_command(&cmd);
 588                                 break;
 589                         }
 590                         break;
 591                 case ISDN_STAT_DHUP:
 592                         if (i < 0)
 593                                 return -1;
 594 #ifdef ISDN_DEBUG_STATCALLB
 595                         printk(KERN_DEBUG "DHUP: %ld\n", c->arg);
 596 #endif
 597                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 598                                 return 0;
 599                         dev->drv[di]->online &= ~(1 << (c->arg));
 600                         isdn_info_update();
 601                         /* Signal hangup to network-devices */
 602                         if (isdn_net_stat_callback(i, c))
 603                                 break;
 604                         isdn_v110_stat_callback(i, c);
 605                         if (isdn_tty_stat_callback(i, c))
 606                                 break;
 607 #ifdef CONFIG_ISDN_DIVERSION
 608                         if (divert_if)
 609                          divert_if->stat_callback(c);
 610 #endif /* CONFIG_ISDN_DIVERSION */
 611                         break;
 612                         break;
 613                 case ISDN_STAT_BCONN:
 614                         if (i < 0)
 615                                 return -1;
 616 #ifdef ISDN_DEBUG_STATCALLB
 617                         printk(KERN_DEBUG "BCONN: %ld\n", c->arg);
 618 #endif
 619                         /* Signal B-channel-connect to network-devices */
 620                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 621                                 return 0;
 622                         dev->drv[di]->online |= (1 << (c->arg));
 623                         isdn_info_update();
 624                         if (isdn_net_stat_callback(i, c))
 625                                 break;
 626                         isdn_v110_stat_callback(i, c);
 627                         if (isdn_tty_stat_callback(i, c))
 628                                 break;
 629                         break;
 630                 case ISDN_STAT_BHUP:
 631                         if (i < 0)
 632                                 return -1;
 633 #ifdef ISDN_DEBUG_STATCALLB
 634                         printk(KERN_DEBUG "BHUP: %ld\n", c->arg);
 635 #endif
 636                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 637                                 return 0;
 638                         dev->drv[di]->online &= ~(1 << (c->arg));
 639                         isdn_info_update();
 640 #ifdef CONFIG_ISDN_X25
 641                         /* Signal hangup to network-devices */
 642                         if (isdn_net_stat_callback(i, c))
 643                                 break;
 644 #endif
 645                         isdn_v110_stat_callback(i, c);
 646                         if (isdn_tty_stat_callback(i, c))
 647                                 break;
 648                         break;
 649                 case ISDN_STAT_NODCH:
 650                         if (i < 0)
 651                                 return -1;
 652 #ifdef ISDN_DEBUG_STATCALLB
 653                         printk(KERN_DEBUG "NODCH: %ld\n", c->arg);
 654 #endif
 655                         if (dev->global_flags & ISDN_GLOBAL_STOPPED)
 656                                 return 0;
 657                         if (isdn_net_stat_callback(i, c))
 658                                 break;
 659                         if (isdn_tty_stat_callback(i, c))
 660                                 break;
 661                         break;
 662                 case ISDN_STAT_ADDCH:
 663                         spin_lock_irqsave(&dev->lock, flags);
 664                         if (isdn_add_channels(dev->drv[di], di, c->arg, 1)) {
 665                                 spin_unlock_irqrestore(&dev->lock, flags);
 666                                 return -1;
 667                         }
 668                         spin_unlock_irqrestore(&dev->lock, flags);
 669                         isdn_info_update();
 670                         break;
 671                 case ISDN_STAT_DISCH:
 672                         spin_lock_irqsave(&dev->lock, flags);
 673                         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 674                                 if ((dev->drvmap[i] == di) &&
 675                                     (dev->chanmap[i] == c->arg)) {
 676                                     if (c->parm.num[0])
 677                                       dev->usage[i] &= ~ISDN_USAGE_DISABLED;
 678                                     else
 679                                       if (USG_NONE(dev->usage[i])) {
 680                                         dev->usage[i] |= ISDN_USAGE_DISABLED;
 681                                       }
 682                                       else
 683                                         retval = -1;
 684                                     break;
 685                                 }
 686                         spin_unlock_irqrestore(&dev->lock, flags);
 687                         isdn_info_update();
 688                         break;
 689                 case ISDN_STAT_UNLOAD:
 690                         while (dev->drv[di]->locks > 0) {
 691                                 isdn_unlock_driver(dev->drv[di]);
 692                         }
 693                         spin_lock_irqsave(&dev->lock, flags);
 694                         isdn_tty_stat_callback(i, c);
 695                         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
 696                                 if (dev->drvmap[i] == di) {
 697                                         dev->drvmap[i] = -1;
 698                                         dev->chanmap[i] = -1;
 699                                         dev->usage[i] &= ~ISDN_USAGE_DISABLED;
 700                                 }
 701                         dev->drivers--;
 702                         dev->channels -= dev->drv[di]->channels;
 703                         kfree(dev->drv[di]->rcverr);
 704                         kfree(dev->drv[di]->rcvcount);
 705                         for (i = 0; i < dev->drv[di]->channels; i++)
 706                                 skb_queue_purge(&dev->drv[di]->rpqueue[i]);
 707                         kfree(dev->drv[di]->rpqueue);
 708                         kfree(dev->drv[di]->rcv_waitq);
 709                         kfree(dev->drv[di]);
 710                         dev->drv[di] = NULL;
 711                         dev->drvid[di][0] = '\0';
 712                         isdn_info_update();
 713                         set_global_features();
 714                         spin_unlock_irqrestore(&dev->lock, flags);
 715                         return 0;
 716                 case ISDN_STAT_L1ERR:
 717                         break;
 718                 case CAPI_PUT_MESSAGE:
 719                         return(isdn_capi_rec_hl_msg(&c->parm.cmsg));
 720 #ifdef CONFIG_ISDN_TTY_FAX
 721                 case ISDN_STAT_FAXIND:
 722                         isdn_tty_stat_callback(i, c);
 723                         break;
 724 #endif
 725 #ifdef CONFIG_ISDN_AUDIO
 726                 case ISDN_STAT_AUDIO:
 727                         isdn_tty_stat_callback(i, c);
 728                         break;
 729 #endif
 730 #ifdef CONFIG_ISDN_DIVERSION
 731                 case ISDN_STAT_PROT:
 732                 case ISDN_STAT_REDIR:
 733                         if (divert_if)
 734                           return(divert_if->stat_callback(c));
 735 #endif /* CONFIG_ISDN_DIVERSION */
 736                 default:
 737                         return -1;
 738         }
 739         return 0;
 740 }
 741
 742 /*
 743  * Get integer from char-pointer, set pointer to end of number
 744  */
 745 int
 746 isdn_getnum(char **p)
 747 {
 748         int v = -1;
 749
 750         while (*p[0] >= '0' && *p[0] <= '9')
 751                 v = ((v < 0) ? 0 : (v * 10)) + (int) ((*p[0]++) - '0');
 752         return v;
 753 }
 754
 755 #define DLE 0x10
 756
 757 /*
 758  * isdn_readbchan() tries to get data from the read-queue.
 759  * It MUST be called with interrupts off.
 760  *
 761  * Be aware that this is not an atomic operation when sleep != 0, even though
 762  * interrupts are turned off! Well, like that we are currently only called
 763  * on behalf of a read system call on raw device files (which are documented
 764  * to be dangerous and for for debugging purpose only). The inode semaphore
 765  * takes care that this is not called for the same minor device number while
 766  * we are sleeping, but access is not serialized against simultaneous read()
 767  * from the corresponding ttyI device. Can other ugly events, like changes
 768  * of the mapping (di,ch)<->minor, happen during the sleep? --he
 769  */
 770 int
 771 isdn_readbchan(int di, int channel, u_char * buf, u_char * fp, int len, wait_queue_head_t *sleep)
 772 {
 773         int count;
 774         int count_pull;
 775         int count_put;
 776         int dflag;
 777         struct sk_buff *skb;
 778         u_char *cp;
 779
 780         if (!dev->drv[di])
 781                 return 0;
 782         if (skb_queue_empty(&dev->drv[di]->rpqueue[channel])) {
 783                 if (sleep)
 784                         interruptible_sleep_on(sleep);
 785                 else
 786                         return 0;
 787         }
 788         if (len > dev->drv[di]->rcvcount[channel])
 789                 len = dev->drv[di]->rcvcount[channel];
 790         cp = buf;
 791         count = 0;
 792         while (len) {
 793                 if (!(skb = skb_peek(&dev->drv[di]->rpqueue[channel])))
 794                         break;
 795 #ifdef CONFIG_ISDN_AUDIO
 796                 if (ISDN_AUDIO_SKB_LOCK(skb))
 797                         break;
 798                 ISDN_AUDIO_SKB_LOCK(skb) = 1;
 799                 if ((ISDN_AUDIO_SKB_DLECOUNT(skb)) || (dev->drv[di]->DLEflag & (1 << channel))) {
 800                         char *p = skb->data;
 801                         unsigned long DLEmask = (1 << channel);
 802
 803                         dflag = 0;
 804                         count_pull = count_put = 0;
 805                         while ((count_pull < skb->len) && (len > 0)) {
 806                                 len--;
 807                                 if (dev->drv[di]->DLEflag & DLEmask) {
 808                                         *cp++ = DLE;
 809                                         dev->drv[di]->DLEflag &= ~DLEmask;
 810                                 } else {
 811                                         *cp++ = *p;
 812                                         if (*p == DLE) {
 813                                                 dev->drv[di]->DLEflag |= DLEmask;
 814                                                 (ISDN_AUDIO_SKB_DLECOUNT(skb))--;
 815                                         }
 816                                         p++;
 817                                         count_pull++;
 818                                 }
 819                                 count_put++;
 820                         }
 821                         if (count_pull >= skb->len)
 822                                 dflag = 1;
 823                 } else {
 824 #endif
 825                         /* No DLE's in buff, so simply copy it */
 826                         dflag = 1;
 827                         if ((count_pull = skb->len) > len) {
 828                                 count_pull = len;
 829                                 dflag = 0;
 830                         }
 831                         count_put = count_pull;
 832                         skb_copy_from_linear_data(skb, cp, count_put);
 833                         cp += count_put;
 834                         len -= count_put;
 835 #ifdef CONFIG_ISDN_AUDIO
 836                 }
 837 #endif
 838                 count += count_put;
 839                 if (fp) {
 840                         memset(fp, 0, count_put);
 841                         fp += count_put;
 842                 }
 843                 if (dflag) {
 844                         /* We got all the data in this buff.
 845                          * Now we can dequeue it.
 846                          */
 847                         if (fp)
 848                                 *(fp - 1) = 0xff;
 849 #ifdef CONFIG_ISDN_AUDIO
 850                         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 851 #endif
 852                         skb = skb_dequeue(&dev->drv[di]->rpqueue[channel]);
 853                         dev_kfree_skb(skb);
 854                 } else {
 855                         /* Not yet emptied this buff, so it
 856                          * must stay in the queue, for further calls
 857                          * but we pull off the data we got until now.
 858                          */
 859                         skb_pull(skb, count_pull);
 860 #ifdef CONFIG_ISDN_AUDIO
 861                         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 862 #endif
 863                 }
 864                 dev->drv[di]->rcvcount[channel] -= count_put;
 865         }
 866         return count;
 867 }
 868
 869 /*
 870  * isdn_readbchan_tty() tries to get data from the read-queue.
 871  * It MUST be called with interrupts off.
 872  *
 873  * Be aware that this is not an atomic operation when sleep != 0, even though
 874  * interrupts are turned off! Well, like that we are currently only called
 875  * on behalf of a read system call on raw device files (which are documented
 876  * to be dangerous and for for debugging purpose only). The inode semaphore
 877  * takes care that this is not called for the same minor device number while
 878  * we are sleeping, but access is not serialized against simultaneous read()
 879  * from the corresponding ttyI device. Can other ugly events, like changes
 880  * of the mapping (di,ch)<->minor, happen during the sleep? --he
 881  */
 882 int
 883 isdn_readbchan_tty(int di, int channel, struct tty_struct *tty, int cisco_hack)
 884 {
 885         int count;
 886         int count_pull;
 887         int count_put;
 888         int dflag;
 889         struct sk_buff *skb;
 890         char last = 0;
 891         int len;
 892
 893         if (!dev->drv[di])
 894                 return 0;
 895         if (skb_queue_empty(&dev->drv[di]->rpqueue[channel]))
 896                         return 0;
 897
 898         len = tty_buffer_request_room(tty, dev->drv[di]->rcvcount[channel]);
 899         if(len == 0)
 900                 return len;
 901
 902         count = 0;
 903         while (len) {
 904                 if (!(skb = skb_peek(&dev->drv[di]->rpqueue[channel])))
 905                         break;
 906 #ifdef CONFIG_ISDN_AUDIO
 907                 if (ISDN_AUDIO_SKB_LOCK(skb))
 908                         break;
 909                 ISDN_AUDIO_SKB_LOCK(skb) = 1;
 910                 if ((ISDN_AUDIO_SKB_DLECOUNT(skb)) || (dev->drv[di]->DLEflag & (1 << channel))) {
 911                         char *p = skb->data;
 912                         unsigned long DLEmask = (1 << channel);
 913
 914                         dflag = 0;
 915                         count_pull = count_put = 0;
 916                         while ((count_pull < skb->len) && (len > 0)) {
 917                                 len--;
 918                                 if (dev->drv[di]->DLEflag & DLEmask) {
 919                                         last = DLE;
 920                                         dev->drv[di]->DLEflag &= ~DLEmask;
 921                                 } else {
 922                                         last = *p;
 923                                         if (last == DLE) {
 924                                                 dev->drv[di]->DLEflag |= DLEmask;
 925                                                 (ISDN_AUDIO_SKB_DLECOUNT(skb))--;
 926                                         }
 927                                         p++;
 928                                         count_pull++;
 929                                 }
 930                                 count_put++;
 931                         }
 932                         if (count_pull >= skb->len)
 933                                 dflag = 1;
 934                 } else {
 935 #endif
 936                         /* No DLE's in buff, so simply copy it */
 937                         dflag = 1;
 938                         if ((count_pull = skb->len) > len) {
 939                                 count_pull = len;
 940                                 dflag = 0;
 941                         }
 942                         count_put = count_pull;
 943                         if(count_put > 1)
 944                                 tty_insert_flip_string(tty, skb->data, count_put - 1);
 945                         last = skb->data[count_put - 1];
 946                         len -= count_put;
 947 #ifdef CONFIG_ISDN_AUDIO
 948                 }
 949 #endif
 950                 count += count_put;
 951                 if (dflag) {
 952                         /* We got all the data in this buff.
 953                          * Now we can dequeue it.
 954                          */
 955                         if(cisco_hack)
 956                                 tty_insert_flip_char(tty, last, 0xFF);
 957                         else
 958                                 tty_insert_flip_char(tty, last, TTY_NORMAL);
 959 #ifdef CONFIG_ISDN_AUDIO
 960                         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 961 #endif
 962                         skb = skb_dequeue(&dev->drv[di]->rpqueue[channel]);
 963                         dev_kfree_skb(skb);
 964                 } else {
 965                         tty_insert_flip_char(tty, last, TTY_NORMAL);
 966                         /* Not yet emptied this buff, so it
 967                          * must stay in the queue, for further calls
 968                          * but we pull off the data we got until now.
 969                          */
 970                         skb_pull(skb, count_pull);
 971 #ifdef CONFIG_ISDN_AUDIO
 972                         ISDN_AUDIO_SKB_LOCK(skb) = 0;
 973 #endif
 974                 }
 975                 dev->drv[di]->rcvcount[channel] -= count_put;
 976         }
 977         return count;
 978 }
 979
 980
 981 static __inline int
 982 isdn_minor2drv(int minor)
 983 {
 984         return (dev->drvmap[minor]);
 985 }
 986
 987 static __inline int
 988 isdn_minor2chan(int minor)
 989 {
 990         return (dev->chanmap[minor]);
 991 }
 992
 993 static char *
 994 isdn_statstr(void)
 995 {
 996         static char istatbuf[2048];
 997         char *p;
 998         int i;
 999
1000         sprintf(istatbuf, "idmap:\t");
1001         p = istatbuf + strlen(istatbuf);
1002         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1003                 sprintf(p, "%s ", (dev->drvmap[i] < 0) ? "-" : dev->drvid[dev->drvmap[i]]);
1004                 p = istatbuf + strlen(istatbuf);
1005         }
1006         sprintf(p, "\nchmap:\t");
1007         p = istatbuf + strlen(istatbuf);
1008         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1009                 sprintf(p, "%d ", dev->chanmap[i]);
1010                 p = istatbuf + strlen(istatbuf);
1011         }
1012         sprintf(p, "\ndrmap:\t");
1013         p = istatbuf + strlen(istatbuf);
1014         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1015                 sprintf(p, "%d ", dev->drvmap[i]);
1016                 p = istatbuf + strlen(istatbuf);
1017         }
1018         sprintf(p, "\nusage:\t");
1019         p = istatbuf + strlen(istatbuf);
1020         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1021                 sprintf(p, "%d ", dev->usage[i]);
1022                 p = istatbuf + strlen(istatbuf);
1023         }
1024         sprintf(p, "\nflags:\t");
1025         p = istatbuf + strlen(istatbuf);
1026         for (i = 0; i < ISDN_MAX_DRIVERS; i++) {
1027                 if (dev->drv[i]) {
1028                         sprintf(p, "%ld ", dev->drv[i]->online);
1029                         p = istatbuf + strlen(istatbuf);
1030                 } else {
1031                         sprintf(p, "? ");
1032                         p = istatbuf + strlen(istatbuf);
1033                 }
1034         }
1035         sprintf(p, "\nphone:\t");
1036         p = istatbuf + strlen(istatbuf);
1037         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1038                 sprintf(p, "%s ", dev->num[i]);
1039                 p = istatbuf + strlen(istatbuf);
1040         }
1041         sprintf(p, "\n");
1042         return istatbuf;
1043 }
1044
1045 /* Module interface-code */
1046
1047 void
1048 isdn_info_update(void)
1049 {
1050         infostruct *p = dev->infochain;
1051
1052         while (p) {
1053                 *(p->private) = 1;
1054                 p = (infostruct *) p->next;
1055         }
1056         wake_up_interruptible(&(dev->info_waitq));
1057 }
1058
1059 static ssize_t
1060 isdn_read(struct file *file, char __user *buf, size_t count, loff_t * off)
1061 {
1062         uint minor = iminor(file->f_path.dentry->d_inode);
1063         int len = 0;
1064         int drvidx;
1065         int chidx;
1066         int retval;
1067         char *p;
1068
1069         lock_kernel();
1070         if (minor == ISDN_MINOR_STATUS) {
1071                 if (!file->private_data) {
1072                         if (file->f_flags & O_NONBLOCK) {
1073                                 retval = -EAGAIN;
1074                                 goto out;
1075                         }
1076                         interruptible_sleep_on(&(dev->info_waitq));
1077                 }
1078                 p = isdn_statstr();
1079                 file->private_data = NULL;
1080                 if ((len = strlen(p)) <= count) {
1081                         if (copy_to_user(buf, p, len)) {
1082                                 retval = -EFAULT;
1083                                 goto out;
1084                         }
1085                         *off += len;
1086                         retval = len;
1087                         goto out;
1088                 }
1089                 retval = 0;
1090                 goto out;
1091         }
1092         if (!dev->drivers) {
1093                 retval = -ENODEV;
1094                 goto out;
1095         }
1096         if (minor <= ISDN_MINOR_BMAX) {
1097                 printk(KERN_WARNING "isdn_read minor %d obsolete!\n", minor);
1098                 drvidx = isdn_minor2drv(minor);
1099                 if (drvidx < 0) {
1100                         retval = -ENODEV;
1101                         goto out;
1102                 }
1103                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
1104                         retval = -ENODEV;
1105                         goto out;
1106                 }
1107                 chidx = isdn_minor2chan(minor);
1108                 if (!(p = kmalloc(count, GFP_KERNEL))) {
1109                         retval = -ENOMEM;
1110                         goto out;
1111                 }
1112                 len = isdn_readbchan(drvidx, chidx, p, NULL, count,
1113                                      &dev->drv[drvidx]->rcv_waitq[chidx]);
1114                 *off += len;
1115                 if (copy_to_user(buf,p,len))
1116                         len = -EFAULT;
1117                 kfree(p);
1118                 retval = len;
1119                 goto out;
1120         }
1121         if (minor <= ISDN_MINOR_CTRLMAX) {
1122                 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1123                 if (drvidx < 0) {
1124                         retval = -ENODEV;
1125                         goto out;
1126                 }
1127                 if (!dev->drv[drvidx]->stavail) {
1128                         if (file->f_flags & O_NONBLOCK) {
1129                                 retval = -EAGAIN;
1130                                 goto out;
1131                         }
1132                         interruptible_sleep_on(&(dev->drv[drvidx]->st_waitq));
1133                 }
1134                 if (dev->drv[drvidx]->interface->readstat) {
1135                         if (count > dev->drv[drvidx]->stavail)
1136                                 count = dev->drv[drvidx]->stavail;
1137                         len = dev->drv[drvidx]->interface->readstat(buf, count,
1138                                 drvidx, isdn_minor2chan(minor - ISDN_MINOR_CTRL));
1139                         if (len < 0) {
1140                                 retval = len;
1141                                 goto out;
1142                         }
1143                 } else {
1144                         len = 0;
1145                 }
1146                 if (len)
1147                         dev->drv[drvidx]->stavail -= len;
1148                 else
1149                         dev->drv[drvidx]->stavail = 0;
1150                 *off += len;
1151                 retval = len;
1152                 goto out;
1153         }
1154 #ifdef CONFIG_ISDN_PPP
1155         if (minor <= ISDN_MINOR_PPPMAX) {
1156                 retval = isdn_ppp_read(minor - ISDN_MINOR_PPP, file, buf, count);
1157                 goto out;
1158         }
1159 #endif
1160         retval = -ENODEV;
1161  out:
1162         unlock_kernel();
1163         return retval;
1164 }
1165
1166 static ssize_t
1167 isdn_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
1168 {
1169         uint minor = iminor(file->f_path.dentry->d_inode);
1170         int drvidx;
1171         int chidx;
1172         int retval;
1173
1174         if (minor == ISDN_MINOR_STATUS)
1175                 return -EPERM;
1176         if (!dev->drivers)
1177                 return -ENODEV;
1178
1179         lock_kernel();
1180         if (minor <= ISDN_MINOR_BMAX) {
1181                 printk(KERN_WARNING "isdn_write minor %d obsolete!\n", minor);
1182                 drvidx = isdn_minor2drv(minor);
1183                 if (drvidx < 0) {
1184                         retval = -ENODEV;
1185                         goto out;
1186                 }
1187                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING)) {
1188                         retval = -ENODEV;
1189                         goto out;
1190                 }
1191                 chidx = isdn_minor2chan(minor);
1192                 while ((retval = isdn_writebuf_stub(drvidx, chidx, buf, count)) == 0)
1193                         interruptible_sleep_on(&dev->drv[drvidx]->snd_waitq[chidx]);
1194                 goto out;
1195         }
1196         if (minor <= ISDN_MINOR_CTRLMAX) {
1197                 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1198                 if (drvidx < 0) {
1199                         retval = -ENODEV;
1200                         goto out;
1201                 }
1202                 /*
1203                  * We want to use the isdnctrl device to load the firmware
1204                  *
1205                  if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1206                  return -ENODEV;
1207                  */
1208                 if (dev->drv[drvidx]->interface->writecmd)
1209                         retval = dev->drv[drvidx]->interface->
1210                                 writecmd(buf, count, drvidx,
1211                                 isdn_minor2chan(minor - ISDN_MINOR_CTRL));
1212                 else
1213                         retval = count;
1214                 goto out;
1215         }
1216 #ifdef CONFIG_ISDN_PPP
1217         if (minor <= ISDN_MINOR_PPPMAX) {
1218                 retval = isdn_ppp_write(minor - ISDN_MINOR_PPP, file, buf, count);
1219                 goto out;
1220         }
1221 #endif
1222         retval = -ENODEV;
1223  out:
1224         unlock_kernel();
1225         return retval;
1226 }
1227
1228 static unsigned int
1229 isdn_poll(struct file *file, poll_table * wait)
1230 {
1231         unsigned int mask = 0;
1232         unsigned int minor = iminor(file->f_path.dentry->d_inode);
1233         int drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1234
1235         lock_kernel();
1236         if (minor == ISDN_MINOR_STATUS) {
1237                 poll_wait(file, &(dev->info_waitq), wait);
1238                 /* mask = POLLOUT | POLLWRNORM; */
1239                 if (file->private_data) {
1240                         mask |= POLLIN | POLLRDNORM;
1241                 }
1242                 goto out;
1243         }
1244         if (minor >= ISDN_MINOR_CTRL && minor <= ISDN_MINOR_CTRLMAX) {
1245                 if (drvidx < 0) {
1246                         /* driver deregistered while file open */
1247                         mask = POLLHUP;
1248                         goto out;
1249                 }
1250                 poll_wait(file, &(dev->drv[drvidx]->st_waitq), wait);
1251                 mask = POLLOUT | POLLWRNORM;
1252                 if (dev->drv[drvidx]->stavail) {
1253                         mask |= POLLIN | POLLRDNORM;
1254                 }
1255                 goto out;
1256         }
1257 #ifdef CONFIG_ISDN_PPP
1258         if (minor <= ISDN_MINOR_PPPMAX) {
1259                 mask = isdn_ppp_poll(file, wait);
1260                 goto out;
1261         }
1262 #endif
1263         mask = POLLERR;
1264  out:
1265         unlock_kernel();
1266         return mask;
1267 }
1268
1269
1270 static int
1271 isdn_ioctl(struct inode *inode, struct file *file, uint cmd, ulong arg)
1272 {
1273         uint minor = iminor(inode);
1274         isdn_ctrl c;
1275         int drvidx;
1276         int chidx;
1277         int ret;
1278         int i;
1279         char __user *p;
1280         char *s;
1281         union iocpar {
1282                 char name[10];
1283                 char bname[22];
1284                 isdn_ioctl_struct iocts;
1285                 isdn_net_ioctl_phone phone;
1286                 isdn_net_ioctl_cfg cfg;
1287         } iocpar;
1288         void __user *argp = (void __user *)arg;
1289
1290 #define name  iocpar.name
1291 #define bname iocpar.bname
1292 #define iocts iocpar.iocts
1293 #define phone iocpar.phone
1294 #define cfg   iocpar.cfg
1295
1296         if (minor == ISDN_MINOR_STATUS) {
1297                 switch (cmd) {
1298                         case IIOCGETDVR:
1299                                 return (TTY_DV +
1300                                         (NET_DV << 8) +
1301                                         (INF_DV << 16));
1302                         case IIOCGETCPS:
1303                                 if (arg) {
1304                                         ulong __user *p = argp;
1305                                         int i;
1306                                         if (!access_ok(VERIFY_WRITE, p,
1307                                                         sizeof(ulong) * ISDN_MAX_CHANNELS * 2))
1308                                                 return -EFAULT;
1309                                         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1310                                                 put_user(dev->ibytes[i], p++);
1311                                                 put_user(dev->obytes[i], p++);
1312                                         }
1313                                         return 0;
1314                                 } else
1315                                         return -EINVAL;
1316                                 break;
1317 #ifdef CONFIG_NETDEVICES
1318                         case IIOCNETGPN:
1319                                 /* Get peer phone number of a connected
1320                                  * isdn network interface */
1321                                 if (arg) {
1322                                         if (copy_from_user(&phone, argp, sizeof(phone)))
1323                                                 return -EFAULT;
1324                                         return isdn_net_getpeer(&phone, argp);
1325                                 } else
1326                                         return -EINVAL;
1327 #endif
1328                         default:
1329                                 return -EINVAL;
1330                 }
1331         }
1332         if (!dev->drivers)
1333                 return -ENODEV;
1334         if (minor <= ISDN_MINOR_BMAX) {
1335                 drvidx = isdn_minor2drv(minor);
1336                 if (drvidx < 0)
1337                         return -ENODEV;
1338                 chidx = isdn_minor2chan(minor);
1339                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1340                         return -ENODEV;
1341                 return 0;
1342         }
1343         if (minor <= ISDN_MINOR_CTRLMAX) {
1344 /*
1345  * isdn net devices manage lots of configuration variables as linked lists.
1346  * Those lists must only be manipulated from user space. Some of the ioctl's
1347  * service routines access user space and are not atomic. Therefor, ioctl's
1348  * manipulating the lists and ioctl's sleeping while accessing the lists
1349  * are serialized by means of a semaphore.
1350  */
1351                 switch (cmd) {
1352                         case IIOCNETDWRSET:
1353                                 printk(KERN_INFO "INFO: ISDN_DW_ABC_EXTENSION not enabled\n");
1354                                 return(-EINVAL);
1355                         case IIOCNETLCR:
1356                                 printk(KERN_INFO "INFO: ISDN_ABC_LCR_SUPPORT not enabled\n");
1357                                 return -ENODEV;
1358 #ifdef CONFIG_NETDEVICES
1359                         case IIOCNETAIF:
1360                                 /* Add a network-interface */
1361                                 if (arg) {
1362                                         if (copy_from_user(name, argp, sizeof(name)))
1363                                                 return -EFAULT;
1364                                         s = name;
1365                                 } else {
1366                                         s = NULL;
1367                                 }
1368                                 ret = mutex_lock_interruptible(&dev->mtx);
1369                                 if( ret ) return ret;
1370                                 if ((s = isdn_net_new(s, NULL))) {
1371                                         if (copy_to_user(argp, s, strlen(s) + 1)){
1372                                                 ret = -EFAULT;
1373                                         } else {
1374                                                 ret = 0;
1375                                         }
1376                                 } else
1377                                         ret = -ENODEV;
1378                                 mutex_unlock(&dev->mtx);
1379                                 return ret;
1380                         case IIOCNETASL:
1381                                 /* Add a slave to a network-interface */
1382                                 if (arg) {
1383                                         if (copy_from_user(bname, argp, sizeof(bname) - 1))
1384                                                 return -EFAULT;
1385                                 } else
1386                                         return -EINVAL;
1387                                 ret = mutex_lock_interruptible(&dev->mtx);
1388                                 if( ret ) return ret;
1389                                 if ((s = isdn_net_newslave(bname))) {
1390                                         if (copy_to_user(argp, s, strlen(s) + 1)){
1391                                                 ret = -EFAULT;
1392                                         } else {
1393                                                 ret = 0;
1394                                         }
1395                                 } else
1396                                         ret = -ENODEV;
1397                                 mutex_unlock(&dev->mtx);
1398                                 return ret;
1399                         case IIOCNETDIF:
1400                                 /* Delete a network-interface */
1401                                 if (arg) {
1402                                         if (copy_from_user(name, argp, sizeof(name)))
1403                                                 return -EFAULT;
1404                                         ret = mutex_lock_interruptible(&dev->mtx);
1405                                         if( ret ) return ret;
1406                                         ret = isdn_net_rm(name);
1407                                         mutex_unlock(&dev->mtx);
1408                                         return ret;
1409                                 } else
1410                                         return -EINVAL;
1411                         case IIOCNETSCF:
1412                                 /* Set configurable parameters of a network-interface */
1413                                 if (arg) {
1414                                         if (copy_from_user(&cfg, argp, sizeof(cfg)))
1415                                                 return -EFAULT;
1416                                         return isdn_net_setcfg(&cfg);
1417                                 } else
1418                                         return -EINVAL;
1419                         case IIOCNETGCF:
1420                                 /* Get configurable parameters of a network-interface */
1421                                 if (arg) {
1422                                         if (copy_from_user(&cfg, argp, sizeof(cfg)))
1423                                                 return -EFAULT;
1424                                         if (!(ret = isdn_net_getcfg(&cfg))) {
1425                                                 if (copy_to_user(argp, &cfg, sizeof(cfg)))
1426                                                         return -EFAULT;
1427                                         }
1428                                         return ret;
1429                                 } else
1430                                         return -EINVAL;
1431                         case IIOCNETANM:
1432                                 /* Add a phone-number to a network-interface */
1433                                 if (arg) {
1434                                         if (copy_from_user(&phone, argp, sizeof(phone)))
1435                                                 return -EFAULT;
1436                                         ret = mutex_lock_interruptible(&dev->mtx);
1437                                         if( ret ) return ret;
1438                                         ret = isdn_net_addphone(&phone);
1439                                         mutex_unlock(&dev->mtx);
1440                                         return ret;
1441                                 } else
1442                                         return -EINVAL;
1443                         case IIOCNETGNM:
1444                                 /* Get list of phone-numbers of a network-interface */
1445                                 if (arg) {
1446                                         if (copy_from_user(&phone, argp, sizeof(phone)))
1447                                                 return -EFAULT;
1448                                         ret = mutex_lock_interruptible(&dev->mtx);
1449                                         if( ret ) return ret;
1450                                         ret = isdn_net_getphones(&phone, argp);
1451                                         mutex_unlock(&dev->mtx);
1452                                         return ret;
1453                                 } else
1454                                         return -EINVAL;
1455                         case IIOCNETDNM:
1456                                 /* Delete a phone-number of a network-interface */
1457                                 if (arg) {
1458                                         if (copy_from_user(&phone, argp, sizeof(phone)))
1459                                                 return -EFAULT;
1460                                         ret = mutex_lock_interruptible(&dev->mtx);
1461                                         if( ret ) return ret;
1462                                         ret = isdn_net_delphone(&phone);
1463                                         mutex_unlock(&dev->mtx);
1464                                         return ret;
1465                                 } else
1466                                         return -EINVAL;
1467                         case IIOCNETDIL:
1468                                 /* Force dialing of a network-interface */
1469                                 if (arg) {
1470                                         if (copy_from_user(name, argp, sizeof(name)))
1471                                                 return -EFAULT;
1472                                         return isdn_net_force_dial(name);
1473                                 } else
1474                                         return -EINVAL;
1475 #ifdef CONFIG_ISDN_PPP
1476                         case IIOCNETALN:
1477                                 if (!arg)
1478                                         return -EINVAL;
1479                                 if (copy_from_user(name, argp, sizeof(name)))
1480                                         return -EFAULT;
1481                                 return isdn_ppp_dial_slave(name);
1482                         case IIOCNETDLN:
1483                                 if (!arg)
1484                                         return -EINVAL;
1485                                 if (copy_from_user(name, argp, sizeof(name)))
1486                                         return -EFAULT;
1487                                 return isdn_ppp_hangup_slave(name);
1488 #endif
1489                         case IIOCNETHUP:
1490                                 /* Force hangup of a network-interface */
1491                                 if (!arg)
1492                                         return -EINVAL;
1493                                 if (copy_from_user(name, argp, sizeof(name)))
1494                                         return -EFAULT;
1495                                 return isdn_net_force_hangup(name);
1496                                 break;
1497 #endif                          /* CONFIG_NETDEVICES */
1498                         case IIOCSETVER:
1499                                 dev->net_verbose = arg;
1500                                 printk(KERN_INFO "isdn: Verbose-Level is %d\n", dev->net_verbose);
1501                                 return 0;
1502                         case IIOCSETGST:
1503                                 if (arg)
1504                                         dev->global_flags |= ISDN_GLOBAL_STOPPED;
1505                                 else
1506                                         dev->global_flags &= ~ISDN_GLOBAL_STOPPED;
1507                                 printk(KERN_INFO "isdn: Global Mode %s\n",
1508                                        (dev->global_flags & ISDN_GLOBAL_STOPPED) ? "stopped" : "running");
1509                                 return 0;
1510                         case IIOCSETBRJ:
1511                                 drvidx = -1;
1512                                 if (arg) {
1513                                         int i;
1514                                         char *p;
1515                                         if (copy_from_user(&iocts, argp,
1516                                              sizeof(isdn_ioctl_struct)))
1517                                                 return -EFAULT;
1518                                         if (strlen(iocts.drvid)) {
1519                                                 if ((p = strchr(iocts.drvid, ',')))
1520                                                         *p = 0;
1521                                                 drvidx = -1;
1522                                                 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1523                                                         if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1524                                                                 drvidx = i;
1525                                                                 break;
1526                                                         }
1527                                         }
1528                                 }
1529                                 if (drvidx == -1)
1530                                         return -ENODEV;
1531                                 if (iocts.arg)
1532                                         dev->drv[drvidx]->flags |= DRV_FLAG_REJBUS;
1533                                 else
1534                                         dev->drv[drvidx]->flags &= ~DRV_FLAG_REJBUS;
1535                                 return 0;
1536                         case IIOCSIGPRF:
1537                                 dev->profd = current;
1538                                 return 0;
1539                                 break;
1540                         case IIOCGETPRF:
1541                                 /* Get all Modem-Profiles */
1542                                 if (arg) {
1543                                         char __user *p = argp;
1544                                         int i;
1545
1546                                         if (!access_ok(VERIFY_WRITE, argp,
1547                                         (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
1548                                                    * ISDN_MAX_CHANNELS))
1549                                                 return -EFAULT;
1550
1551                                         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1552                                                 if (copy_to_user(p, dev->mdm.info[i].emu.profile,
1553                                                       ISDN_MODEM_NUMREG))
1554                                                         return -EFAULT;
1555                                                 p += ISDN_MODEM_NUMREG;
1556                                                 if (copy_to_user(p, dev->mdm.info[i].emu.pmsn, ISDN_MSNLEN))
1557                                                         return -EFAULT;
1558                                                 p += ISDN_MSNLEN;
1559                                                 if (copy_to_user(p, dev->mdm.info[i].emu.plmsn, ISDN_LMSNLEN))
1560                                                         return -EFAULT;
1561                                                 p += ISDN_LMSNLEN;
1562                                         }
1563                                         return (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN) * ISDN_MAX_CHANNELS;
1564                                 } else
1565                                         return -EINVAL;
1566                                 break;
1567                         case IIOCSETPRF:
1568                                 /* Set all Modem-Profiles */
1569                                 if (arg) {
1570                                         char __user *p = argp;
1571                                         int i;
1572
1573                                         if (!access_ok(VERIFY_READ, argp,
1574                                         (ISDN_MODEM_NUMREG + ISDN_MSNLEN + ISDN_LMSNLEN)
1575                                                    * ISDN_MAX_CHANNELS))
1576                                                 return -EFAULT;
1577
1578                                         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
1579                                                 if (copy_from_user(dev->mdm.info[i].emu.profile, p,
1580                                                      ISDN_MODEM_NUMREG))
1581                                                         return -EFAULT;
1582                                                 p += ISDN_MODEM_NUMREG;
1583                                                 if (copy_from_user(dev->mdm.info[i].emu.plmsn, p, ISDN_LMSNLEN))
1584                                                         return -EFAULT;
1585                                                 p += ISDN_LMSNLEN;
1586                                                 if (copy_from_user(dev->mdm.info[i].emu.pmsn, p, ISDN_MSNLEN))
1587                                                         return -EFAULT;
1588                                                 p += ISDN_MSNLEN;
1589                                         }
1590                                         return 0;
1591                                 } else
1592                                         return -EINVAL;
1593                                 break;
1594                         case IIOCSETMAP:
1595                         case IIOCGETMAP:
1596                                 /* Set/Get MSN->EAZ-Mapping for a driver */
1597                                 if (arg) {
1598
1599                                         if (copy_from_user(&iocts, argp,
1600                                              sizeof(isdn_ioctl_struct)))
1601                                                 return -EFAULT;
1602                                         if (strlen(iocts.drvid)) {
1603                                                 drvidx = -1;
1604                                                 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1605                                                         if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1606                                                                 drvidx = i;
1607                                                                 break;
1608                                                         }
1609                                         } else
1610                                                 drvidx = 0;
1611                                         if (drvidx == -1)
1612                                                 return -ENODEV;
1613                                         if (cmd == IIOCSETMAP) {
1614                                                 int loop = 1;
1615
1616                                                 p = (char __user *) iocts.arg;
1617                                                 i = 0;
1618                                                 while (loop) {
1619                                                         int j = 0;
1620
1621                                                         while (1) {
1622                                                                 if (!access_ok(VERIFY_READ, p, 1))
1623                                                                         return -EFAULT;
1624                                                                 get_user(bname[j], p++);
1625                                                                 switch (bname[j]) {
1626                                                                         case '\0':
1627                                                                                 loop = 0;
1628                                                                                 /* Fall through */
1629                                                                         case ',':
1630                                                                                 bname[j] = '\0';
1631                                                                                 strcpy(dev->drv[drvidx]->msn2eaz[i], bname);
1632                                                                                 j = ISDN_MSNLEN;
1633                                                                                 break;
1634                                                                         default:
1635                                                                                 j++;
1636                                                                 }
1637                                                                 if (j >= ISDN_MSNLEN)
1638                                                                         break;
1639                                                         }
1640                                                         if (++i > 9)
1641                                                                 break;
1642                                                 }
1643                                         } else {
1644                                                 p = (char __user *) iocts.arg;
1645                                                 for (i = 0; i < 10; i++) {
1646                                                         sprintf(bname, "%s%s",
1647                                                                 strlen(dev->drv[drvidx]->msn2eaz[i]) ?
1648                                                                 dev->drv[drvidx]->msn2eaz[i] : "_",
1649                                                                 (i < 9) ? "," : "\0");
1650                                                         if (copy_to_user(p, bname, strlen(bname) + 1))
1651                                                                 return -EFAULT;
1652                                                         p += strlen(bname);
1653                                                 }
1654                                         }
1655                                         return 0;
1656                                 } else
1657                                         return -EINVAL;
1658                         case IIOCDBGVAR:
1659                                 if (arg) {
1660                                         if (copy_to_user(argp, &dev, sizeof(ulong)))
1661                                                 return -EFAULT;
1662                                         return 0;
1663                                 } else
1664                                         return -EINVAL;
1665                                 break;
1666                         default:
1667                                 if ((cmd & IIOCDRVCTL) == IIOCDRVCTL)
1668                                         cmd = ((cmd >> _IOC_NRSHIFT) & _IOC_NRMASK) & ISDN_DRVIOCTL_MASK;
1669                                 else
1670                                         return -EINVAL;
1671                                 if (arg) {
1672                                         int i;
1673                                         char *p;
1674                                         if (copy_from_user(&iocts, argp, sizeof(isdn_ioctl_struct)))
1675                                                 return -EFAULT;
1676                                         if (strlen(iocts.drvid)) {
1677                                                 if ((p = strchr(iocts.drvid, ',')))
1678                                                         *p = 0;
1679                                                 drvidx = -1;
1680                                                 for (i = 0; i < ISDN_MAX_DRIVERS; i++)
1681                                                         if (!(strcmp(dev->drvid[i], iocts.drvid))) {
1682                                                                 drvidx = i;
1683                                                                 break;
1684                                                         }
1685                                         } else
1686                                                 drvidx = 0;
1687                                         if (drvidx == -1)
1688                                                 return -ENODEV;
1689                                         if (!access_ok(VERIFY_WRITE, argp,
1690                                              sizeof(isdn_ioctl_struct)))
1691                                                 return -EFAULT;
1692                                         c.driver = drvidx;
1693                                         c.command = ISDN_CMD_IOCTL;
1694                                         c.arg = cmd;
1695                                         memcpy(c.parm.num, &iocts.arg, sizeof(ulong));
1696                                         ret = isdn_command(&c);
1697                                         memcpy(&iocts.arg, c.parm.num, sizeof(ulong));
1698                                         if (copy_to_user(argp, &iocts, sizeof(isdn_ioctl_struct)))
1699                                                 return -EFAULT;
1700                                         return ret;
1701                                 } else
1702                                         return -EINVAL;
1703                 }
1704         }
1705 #ifdef CONFIG_ISDN_PPP
1706         if (minor <= ISDN_MINOR_PPPMAX)
1707                 return (isdn_ppp_ioctl(minor - ISDN_MINOR_PPP, file, cmd, arg));
1708 #endif
1709         return -ENODEV;
1710
1711 #undef name
1712 #undef bname
1713 #undef iocts
1714 #undef phone
1715 #undef cfg
1716 }
1717
1718 /*
1719  * Open the device code.
1720  */
1721 static int
1722 isdn_open(struct inode *ino, struct file *filep)
1723 {
1724         uint minor = iminor(ino);
1725         int drvidx;
1726         int chidx;
1727         int retval = -ENODEV;
1728
1729
1730         if (minor == ISDN_MINOR_STATUS) {
1731                 infostruct *p;
1732
1733                 if ((p = kmalloc(sizeof(infostruct), GFP_KERNEL))) {
1734                         p->next = (char *) dev->infochain;
1735                         p->private = (char *) &(filep->private_data);
1736                         dev->infochain = p;
1737                         /* At opening we allow a single update */
1738                         filep->private_data = (char *) 1;
1739                         retval = 0;
1740                         goto out;
1741                 } else {
1742                         retval = -ENOMEM;
1743                         goto out;
1744                 }
1745         }
1746         if (!dev->channels)
1747                 goto out;
1748         if (minor <= ISDN_MINOR_BMAX) {
1749                 printk(KERN_WARNING "isdn_open minor %d obsolete!\n", minor);
1750                 drvidx = isdn_minor2drv(minor);
1751                 if (drvidx < 0)
1752                         goto out;
1753                 chidx = isdn_minor2chan(minor);
1754                 if (!(dev->drv[drvidx]->flags & DRV_FLAG_RUNNING))
1755                         goto out;
1756                 if (!(dev->drv[drvidx]->online & (1 << chidx)))
1757                         goto out;
1758                 isdn_lock_drivers();
1759                 retval = 0;
1760                 goto out;
1761         }
1762         if (minor <= ISDN_MINOR_CTRLMAX) {
1763                 drvidx = isdn_minor2drv(minor - ISDN_MINOR_CTRL);
1764                 if (drvidx < 0)
1765                         goto out;
1766                 isdn_lock_drivers();
1767                 retval = 0;
1768                 goto out;
1769         }
1770 #ifdef CONFIG_ISDN_PPP
1771         if (minor <= ISDN_MINOR_PPPMAX) {
1772                 retval = isdn_ppp_open(minor - ISDN_MINOR_PPP, filep);
1773                 if (retval == 0)
1774                         isdn_lock_drivers();
1775                 goto out;
1776         }
1777 #endif
1778  out:
1779         nonseekable_open(ino, filep);
1780         return retval;
1781 }
1782
1783 static int
1784 isdn_close(struct inode *ino, struct file *filep)
1785 {
1786         uint minor = iminor(ino);
1787
1788         lock_kernel();
1789         if (minor == ISDN_MINOR_STATUS) {
1790                 infostruct *p = dev->infochain;
1791                 infostruct *q = NULL;
1792
1793                 while (p) {
1794                         if (p->private == (char *) &(filep->private_data)) {
1795                                 if (q)
1796                                         q->next = p->next;
1797                                 else
1798                                         dev->infochain = (infostruct *) (p->next);
1799                                 kfree(p);
1800                                 goto out;
1801                         }
1802                         q = p;
1803                         p = (infostruct *) (p->next);
1804                 }
1805                 printk(KERN_WARNING "isdn: No private data while closing isdnctrl\n");
1806                 goto out;
1807         }
1808         isdn_unlock_drivers();
1809         if (minor <= ISDN_MINOR_BMAX)
1810                 goto out;
1811         if (minor <= ISDN_MINOR_CTRLMAX) {
1812                 if (dev->profd == current)
1813                         dev->profd = NULL;
1814                 goto out;
1815         }
1816 #ifdef CONFIG_ISDN_PPP
1817         if (minor <= ISDN_MINOR_PPPMAX)
1818                 isdn_ppp_release(minor - ISDN_MINOR_PPP, filep);
1819 #endif
1820
1821  out:
1822         unlock_kernel();
1823         return 0;
1824 }
1825
1826 static const struct file_operations isdn_fops =
1827 {
1828         .owner          = THIS_MODULE,
1829         .llseek         = no_llseek,
1830         .read           = isdn_read,
1831         .write          = isdn_write,
1832         .poll           = isdn_poll,
1833         .ioctl          = isdn_ioctl,
1834         .open           = isdn_open,
1835         .release        = isdn_close,
1836 };
1837
1838 char *
1839 isdn_map_eaz2msn(char *msn, int di)
1840 {
1841         isdn_driver_t *this = dev->drv[di];
1842         int i;
1843
1844         if (strlen(msn) == 1) {
1845                 i = msn[0] - '0';
1846                 if ((i >= 0) && (i <= 9))
1847                         if (strlen(this->msn2eaz[i]))
1848                                 return (this->msn2eaz[i]);
1849         }
1850         return (msn);
1851 }
1852
1853 /*
1854  * Find an unused ISDN-channel, whose feature-flags match the
1855  * given L2- and L3-protocols.
1856  */
1857 #define L2V (~(ISDN_FEATURE_L2_V11096|ISDN_FEATURE_L2_V11019|ISDN_FEATURE_L2_V11038))
1858
1859 /*
1860  * This function must be called with holding the dev->lock.
1861  */
1862 int
1863 isdn_get_free_channel(int usage, int l2_proto, int l3_proto, int pre_dev
1864                       ,int pre_chan, char *msn)
1865 {
1866         int i;
1867         ulong features;
1868         ulong vfeatures;
1869
1870         features = ((1 << l2_proto) | (0x10000 << l3_proto));
1871         vfeatures = (((1 << l2_proto) | (0x10000 << l3_proto)) &
1872                      ~(ISDN_FEATURE_L2_V11096|ISDN_FEATURE_L2_V11019|ISDN_FEATURE_L2_V11038));
1873         /* If Layer-2 protocol is V.110, accept drivers with
1874          * transparent feature even if these don't support V.110
1875          * because we can emulate this in linklevel.
1876          */
1877         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1878                 if (USG_NONE(dev->usage[i]) &&
1879                     (dev->drvmap[i] != -1)) {
1880                         int d = dev->drvmap[i];
1881                         if ((dev->usage[i] & ISDN_USAGE_EXCLUSIVE) &&
1882                         ((pre_dev != d) || (pre_chan != dev->chanmap[i])))
1883                                 continue;
1884                         if (!strcmp(isdn_map_eaz2msn(msn, d), "-"))
1885                                 continue;
1886                         if (dev->usage[i] & ISDN_USAGE_DISABLED)
1887                                 continue; /* usage not allowed */
1888                         if (dev->drv[d]->flags & DRV_FLAG_RUNNING) {
1889                                 if (((dev->drv[d]->interface->features & features) == features) ||
1890                                     (((dev->drv[d]->interface->features & vfeatures) == vfeatures) &&
1891                                      (dev->drv[d]->interface->features & ISDN_FEATURE_L2_TRANS))) {
1892                                         if ((pre_dev < 0) || (pre_chan < 0)) {
1893                                                 dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
1894                                                 dev->usage[i] |= usage;
1895                                                 isdn_info_update();
1896                                                 return i;
1897                                         } else {
1898                                                 if ((pre_dev == d) && (pre_chan == dev->chanmap[i])) {
1899                                                         dev->usage[i] &= ISDN_USAGE_EXCLUSIVE;
1900                                                         dev->usage[i] |= usage;
1901                                                         isdn_info_update();
1902                                                         return i;
1903                                                 }
1904                                         }
1905                                 }
1906                         }
1907                 }
1908         return -1;
1909 }
1910
1911 /*
1912  * Set state of ISDN-channel to 'unused'
1913  */
1914 void
1915 isdn_free_channel(int di, int ch, int usage)
1916 {
1917         int i;
1918
1919         if ((di < 0) || (ch < 0)) {
1920                 printk(KERN_WARNING "%s: called with invalid drv(%d) or channel(%d)\n",
1921                         __FUNCTION__, di, ch);
1922                 return;
1923         }
1924         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1925                 if (((!usage) || ((dev->usage[i] & ISDN_USAGE_MASK) == usage)) &&
1926                     (dev->drvmap[i] == di) &&
1927                     (dev->chanmap[i] == ch)) {
1928                         dev->usage[i] &= (ISDN_USAGE_NONE | ISDN_USAGE_EXCLUSIVE);
1929                         strcpy(dev->num[i], "???");
1930                         dev->ibytes[i] = 0;
1931                         dev->obytes[i] = 0;
1932 // 20.10.99 JIM, try to reinitialize v110 !
1933                         dev->v110emu[i] = 0;
1934                         atomic_set(&(dev->v110use[i]), 0);
1935                         isdn_v110_close(dev->v110[i]);
1936                         dev->v110[i] = NULL;
1937 // 20.10.99 JIM, try to reinitialize v110 !
1938                         isdn_info_update();
1939                         if (dev->drv[di])
1940                                 skb_queue_purge(&dev->drv[di]->rpqueue[ch]);
1941                 }
1942 }
1943
1944 /*
1945  * Cancel Exclusive-Flag for ISDN-channel
1946  */
1947 void
1948 isdn_unexclusive_channel(int di, int ch)
1949 {
1950         int i;
1951
1952         for (i = 0; i < ISDN_MAX_CHANNELS; i++)
1953                 if ((dev->drvmap[i] == di) &&
1954                     (dev->chanmap[i] == ch)) {
1955                         dev->usage[i] &= ~ISDN_USAGE_EXCLUSIVE;
1956                         isdn_info_update();
1957                         return;
1958                 }
1959 }
1960
1961 /*
1962  *  writebuf replacement for SKB_ABLE drivers
1963  */
1964 static int
1965 isdn_writebuf_stub(int drvidx, int chan, const u_char __user * buf, int len)
1966 {
1967         int ret;
1968         int hl = dev->drv[drvidx]->interface->hl_hdrlen;
1969         struct sk_buff *skb = alloc_skb(hl + len, GFP_ATOMIC);
1970
1971         if (!skb)
1972                 return -ENOMEM;
1973         skb_reserve(skb, hl);
1974         if (copy_from_user(skb_put(skb, len), buf, len))
1975                 return -EFAULT;
1976         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, 1, skb);
1977         if (ret <= 0)
1978                 dev_kfree_skb(skb);
1979         if (ret > 0)
1980                 dev->obytes[isdn_dc2minor(drvidx, chan)] += ret;
1981         return ret;
1982 }
1983
1984 /*
1985  * Return: length of data on success, -ERRcode on failure.
1986  */
1987 int
1988 isdn_writebuf_skb_stub(int drvidx, int chan, int ack, struct sk_buff *skb)
1989 {
1990         int ret;
1991         struct sk_buff *nskb = NULL;
1992         int v110_ret = skb->len;
1993         int idx = isdn_dc2minor(drvidx, chan);
1994
1995         if (dev->v110[idx]) {
1996                 atomic_inc(&dev->v110use[idx]);
1997                 nskb = isdn_v110_encode(dev->v110[idx], skb);
1998                 atomic_dec(&dev->v110use[idx]);
1999                 if (!nskb)
2000                         return 0;
2001                 v110_ret = *((int *)nskb->data);
2002                 skb_pull(nskb, sizeof(int));
2003                 if (!nskb->len) {
2004                         dev_kfree_skb(nskb);
2005                         return v110_ret;
2006                 }
2007                 /* V.110 must always be acknowledged */
2008                 ack = 1;
2009                 ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, nskb);
2010         } else {
2011                 int hl = dev->drv[drvidx]->interface->hl_hdrlen;
2012
2013                 if( skb_headroom(skb) < hl ){
2014                         /*
2015                          * This should only occur when new HL driver with
2016                          * increased hl_hdrlen was loaded after netdevice
2017                          * was created and connected to the new driver.
2018                          *
2019                          * The V.110 branch (re-allocates on its own) does
2020                          * not need this
2021                          */
2022                         struct sk_buff * skb_tmp;
2023
2024                         skb_tmp = skb_realloc_headroom(skb, hl);
2025                         printk(KERN_DEBUG "isdn_writebuf_skb_stub: reallocating headroom%s\n", skb_tmp ? "" : " failed");
2026                         if (!skb_tmp) return -ENOMEM; /* 0 better? */
2027                         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb_tmp);
2028                         if( ret > 0 ){
2029                                 dev_kfree_skb(skb);
2030                         } else {
2031                                 dev_kfree_skb(skb_tmp);
2032                         }
2033                 } else {
2034                         ret = dev->drv[drvidx]->interface->writebuf_skb(drvidx, chan, ack, skb);
2035                 }
2036         }
2037         if (ret > 0) {
2038                 dev->obytes[idx] += ret;
2039                 if (dev->v110[idx]) {
2040                         atomic_inc(&dev->v110use[idx]);
2041                         dev->v110[idx]->skbuser++;
2042                         atomic_dec(&dev->v110use[idx]);
2043                         /* For V.110 return unencoded data length */
2044                         ret = v110_ret;
2045                         /* if the complete frame was send we free the skb;
2046                            if not upper function will requeue the skb */
2047                         if (ret == skb->len)
2048                                 dev_kfree_skb(skb);
2049                 }
2050         } else
2051                 if (dev->v110[idx])
2052                         dev_kfree_skb(nskb);
2053         return ret;
2054 }
2055
2056 static int
2057 isdn_add_channels(isdn_driver_t *d, int drvidx, int n, int adding)
2058 {
2059         int j, k, m;
2060
2061         init_waitqueue_head(&d->st_waitq);
2062         if (d->flags & DRV_FLAG_RUNNING)
2063                 return -1;
2064         if (n < 1) return 0;
2065
2066         m = (adding) ? d->channels + n : n;
2067
2068         if (dev->channels + n > ISDN_MAX_CHANNELS) {
2069                 printk(KERN_WARNING "register_isdn: Max. %d channels supported\n",
2070                        ISDN_MAX_CHANNELS);
2071                 return -1;
2072         }
2073
2074         if ((adding) && (d->rcverr))
2075                 kfree(d->rcverr);
2076         if (!(d->rcverr = kzalloc(sizeof(int) * m, GFP_ATOMIC))) {
2077                 printk(KERN_WARNING "register_isdn: Could not alloc rcverr\n");
2078                 return -1;
2079         }
2080
2081         if ((adding) && (d->rcvcount))
2082                 kfree(d->rcvcount);
2083         if (!(d->rcvcount = kzalloc(sizeof(int) * m, GFP_ATOMIC))) {
2084                 printk(KERN_WARNING "register_isdn: Could not alloc rcvcount\n");
2085                 if (!adding)
2086                         kfree(d->rcverr);
2087                 return -1;
2088         }
2089
2090         if ((adding) && (d->rpqueue)) {
2091                 for (j = 0; j < d->channels; j++)
2092                         skb_queue_purge(&d->rpqueue[j]);
2093                 kfree(d->rpqueue);
2094         }
2095         if (!(d->rpqueue = kmalloc(sizeof(struct sk_buff_head) * m, GFP_ATOMIC))) {
2096                 printk(KERN_WARNING "register_isdn: Could not alloc rpqueue\n");
2097                 if (!adding) {
2098                         kfree(d->rcvcount);
2099                         kfree(d->rcverr);
2100                 }
2101                 return -1;
2102         }
2103         for (j = 0; j < m; j++) {
2104                 skb_queue_head_init(&d->rpqueue[j]);
2105         }
2106
2107         if ((adding) && (d->rcv_waitq))
2108                 kfree(d->rcv_waitq);
2109         d->rcv_waitq = kmalloc(sizeof(wait_queue_head_t) * 2 * m, GFP_ATOMIC);
2110         if (!d->rcv_waitq) {
2111                 printk(KERN_WARNING "register_isdn: Could not alloc rcv_waitq\n");
2112                 if (!adding) {
2113                         kfree(d->rpqueue);
2114                         kfree(d->rcvcount);
2115                         kfree(d->rcverr);
2116                 }
2117                 return -1;
2118         }
2119         d->snd_waitq = d->rcv_waitq + m;
2120         for (j = 0; j < m; j++) {
2121                 init_waitqueue_head(&d->rcv_waitq[j]);
2122                 init_waitqueue_head(&d->snd_waitq[j]);
2123         }
2124
2125         dev->channels += n;
2126         for (j = d->channels; j < m; j++)
2127                 for (k = 0; k < ISDN_MAX_CHANNELS; k++)
2128                         if (dev->chanmap[k] < 0) {
2129                                 dev->chanmap[k] = j;
2130                                 dev->drvmap[k] = drvidx;
2131                                 break;
2132                         }
2133         d->channels = m;
2134         return 0;
2135 }
2136
2137 /*
2138  * Low-level-driver registration
2139  */
2140
2141 static void
2142 set_global_features(void)
2143 {
2144         int drvidx;
2145
2146         dev->global_features = 0;
2147         for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++) {
2148                 if (!dev->drv[drvidx])
2149                         continue;
2150                 if (dev->drv[drvidx]->interface)
2151                         dev->global_features |= dev->drv[drvidx]->interface->features;
2152         }
2153 }
2154
2155 #ifdef CONFIG_ISDN_DIVERSION
2156
2157 static char *map_drvname(int di)
2158 {
2159   if ((di < 0) || (di >= ISDN_MAX_DRIVERS))
2160     return(NULL);
2161   return(dev->drvid[di]); /* driver name */
2162 } /* map_drvname */
2163
2164 static int map_namedrv(char *id)
2165 {  int i;
2166
2167    for (i = 0; i < ISDN_MAX_DRIVERS; i++)
2168     { if (!strcmp(dev->drvid[i],id))
2169         return(i);
2170     }
2171    return(-1);
2172 } /* map_namedrv */
2173
2174 int DIVERT_REG_NAME(isdn_divert_if *i_div)
2175 {
2176   if (i_div->if_magic != DIVERT_IF_MAGIC)
2177     return(DIVERT_VER_ERR);
2178   switch (i_div->cmd)
2179     {
2180       case DIVERT_CMD_REL:
2181         if (divert_if != i_div)
2182           return(DIVERT_REL_ERR);
2183         divert_if = NULL; /* free interface */
2184         return(DIVERT_NO_ERR);
2185
2186       case DIVERT_CMD_REG:
2187         if (divert_if)
2188           return(DIVERT_REG_ERR);
2189         i_div->ll_cmd = isdn_command; /* set command function */
2190         i_div->drv_to_name = map_drvname;
2191         i_div->name_to_drv = map_namedrv;
2192         divert_if = i_div; /* remember interface */
2193         return(DIVERT_NO_ERR);
2194
2195       default:
2196         return(DIVERT_CMD_ERR);
2197     }
2198 } /* DIVERT_REG_NAME */
2199
2200 EXPORT_SYMBOL(DIVERT_REG_NAME);
2201
2202 #endif /* CONFIG_ISDN_DIVERSION */
2203
2204
2205 EXPORT_SYMBOL(register_isdn);
2206 #ifdef CONFIG_ISDN_PPP
2207 EXPORT_SYMBOL(isdn_ppp_register_compressor);
2208 EXPORT_SYMBOL(isdn_ppp_unregister_compressor);
2209 #endif
2210
2211 int
2212 register_isdn(isdn_if * i)
2213 {
2214         isdn_driver_t *d;
2215         int j;
2216         ulong flags;
2217         int drvidx;
2218
2219         if (dev->drivers >= ISDN_MAX_DRIVERS) {
2220                 printk(KERN_WARNING "register_isdn: Max. %d drivers supported\n",
2221                        ISDN_MAX_DRIVERS);
2222                 return 0;
2223         }
2224         if (!i->writebuf_skb) {
2225                 printk(KERN_WARNING "register_isdn: No write routine given.\n");
2226                 return 0;
2227         }
2228         if (!(d = kzalloc(sizeof(isdn_driver_t), GFP_KERNEL))) {
2229                 printk(KERN_WARNING "register_isdn: Could not alloc driver-struct\n");
2230                 return 0;
2231         }
2232
2233         d->maxbufsize = i->maxbufsize;
2234         d->pktcount = 0;
2235         d->stavail = 0;
2236         d->flags = DRV_FLAG_LOADED;
2237         d->online = 0;
2238         d->interface = i;
2239         d->channels = 0;
2240         spin_lock_irqsave(&dev->lock, flags);
2241         for (drvidx = 0; drvidx < ISDN_MAX_DRIVERS; drvidx++)
2242                 if (!dev->drv[drvidx])
2243                         break;
2244         if (isdn_add_channels(d, drvidx, i->channels, 0)) {
2245                 spin_unlock_irqrestore(&dev->lock, flags);
2246                 kfree(d);
2247                 return 0;
2248         }
2249         i->channels = drvidx;
2250         i->rcvcallb_skb = isdn_receive_skb_callback;
2251         i->statcallb = isdn_status_callback;
2252         if (!strlen(i->id))
2253                 sprintf(i->id, "line%d", drvidx);
2254         for (j = 0; j < drvidx; j++)
2255                 if (!strcmp(i->id, dev->drvid[j]))
2256                         sprintf(i->id, "line%d", drvidx);
2257         dev->drv[drvidx] = d;
2258         strcpy(dev->drvid[drvidx], i->id);
2259         isdn_info_update();
2260         dev->drivers++;
2261         set_global_features();
2262         spin_unlock_irqrestore(&dev->lock, flags);
2263         return 1;
2264 }
2265
2266 /*
2267  *****************************************************************************
2268  * And now the modules code.
2269  *****************************************************************************
2270  */
2271
2272 static char *
2273 isdn_getrev(const char *revision)
2274 {
2275         char *rev;
2276         char *p;
2277
2278         if ((p = strchr(revision, ':'))) {
2279                 rev = p + 2;
2280                 p = strchr(rev, '$');
2281                 *--p = 0;
2282         } else
2283                 rev = "???";
2284         return rev;
2285 }
2286
2287 /*
2288  * Allocate and initialize all data, register modem-devices
2289  */
2290 static int __init isdn_init(void)
2291 {
2292         int i;
2293         char tmprev[50];
2294
2295         if (!(dev = vmalloc(sizeof(isdn_dev)))) {
2296                 printk(KERN_WARNING "isdn: Could not allocate device-struct.\n");
2297                 return -EIO;
2298         }
2299         memset((char *) dev, 0, sizeof(isdn_dev));
2300         init_timer(&dev->timer);
2301         dev->timer.function = isdn_timer_funct;
2302         spin_lock_init(&dev->lock);
2303         spin_lock_init(&dev->timerlock);
2304 #ifdef MODULE
2305         dev->owner = THIS_MODULE;
2306 #endif
2307         mutex_init(&dev->mtx);
2308         init_waitqueue_head(&dev->info_waitq);
2309         for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
2310                 dev->drvmap[i] = -1;
2311                 dev->chanmap[i] = -1;
2312                 dev->m_idx[i] = -1;
2313                 strcpy(dev->num[i], "???");
2314                 init_waitqueue_head(&dev->mdm.info[i].open_wait);
2315                 init_waitqueue_head(&dev->mdm.info[i].close_wait);
2316         }
2317         if (register_chrdev(ISDN_MAJOR, "isdn", &isdn_fops)) {
2318                 printk(KERN_WARNING "isdn: Could not register control devices\n");
2319                 vfree(dev);
2320                 return -EIO;
2321         }
2322         if ((isdn_tty_modem_init()) < 0) {
2323                 printk(KERN_WARNING "isdn: Could not register tty devices\n");
2324                 vfree(dev);
2325                 unregister_chrdev(ISDN_MAJOR, "isdn");
2326                 return -EIO;
2327         }
2328 #ifdef CONFIG_ISDN_PPP
2329         if (isdn_ppp_init() < 0) {
2330                 printk(KERN_WARNING "isdn: Could not create PPP-device-structs\n");
2331                 isdn_tty_exit();
2332                 unregister_chrdev(ISDN_MAJOR, "isdn");
2333                 vfree(dev);
2334                 return -EIO;
2335         }
2336 #endif                          /* CONFIG_ISDN_PPP */
2337
2338         strcpy(tmprev, isdn_revision);
2339         printk(KERN_NOTICE "ISDN subsystem Rev: %s/", isdn_getrev(tmprev));
2340         strcpy(tmprev, isdn_tty_revision);
2341         printk("%s/", isdn_getrev(tmprev));
2342         strcpy(tmprev, isdn_net_revision);
2343         printk("%s/", isdn_getrev(tmprev));
2344         strcpy(tmprev, isdn_ppp_revision);
2345         printk("%s/", isdn_getrev(tmprev));
2346         strcpy(tmprev, isdn_audio_revision);
2347         printk("%s/", isdn_getrev(tmprev));
2348         strcpy(tmprev, isdn_v110_revision);
2349         printk("%s", isdn_getrev(tmprev));
2350
2351 #ifdef MODULE
2352         printk(" loaded\n");
2353 #else
2354         printk("\n");
2355 #endif
2356         isdn_info_update();
2357         return 0;
2358 }
2359
2360 /*
2361  * Unload module
2362  */
2363 static void __exit isdn_exit(void)
2364 {
2365 #ifdef CONFIG_ISDN_PPP
2366         isdn_ppp_cleanup();
2367 #endif
2368         if (isdn_net_rmall() < 0) {
2369                 printk(KERN_WARNING "isdn: net-device busy, remove cancelled\n");
2370                 return;
2371         }
2372         isdn_tty_exit();
2373         unregister_chrdev(ISDN_MAJOR, "isdn");
2374         del_timer(&dev->timer);
2375         /* call vfree with interrupts enabled, else it will hang */
2376         vfree(dev);
2377         printk(KERN_NOTICE "ISDN-subsystem unloaded\n");
2378 }
2379
2380 module_init(isdn_init);
2381 module_exit(isdn_exit);